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  <div id="layout-content"><div id="function.bzdecompress" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">bzdecompress</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.4, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">bzdecompress</span> &mdash; <span class="dc-title">解压经 bzip2 编码过的数据</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.bzdecompress-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>bzdecompress</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$use_less_memory</code><span class="initializer"> = <strong><code>false</code></strong></span></span>): <span class="type"><span class="type">string</span>|<span class="type">int</span>|<span class="type"><span class="type false">false</span></span></span></div>

  <p class="para rdfs-comment">
   <span class="function"><strong>bzdecompress()</strong></span> 解压了包含 bzip2 压缩数据的指定字符串。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.bzdecompress-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">data</code></dt>

     <dd>

      <p class="para">
       要解压的字符串。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">use_less_memory</code></dt>

     <dd>

      <p class="para">
       如果为 <strong><code>true</code></strong>，将会使用一种内存开销更小的替代算法（最大内存需求降低至大约 2300K）但速度会降低约一半。
      </p>
      <p class="para">
       寻找该功能的更多信息可参见 <a href="https://www.sourceware.org/bzip2/" class="link external">&raquo;&nbsp;bzip2 文档</a>。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.bzdecompress-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回解压后的字符串或者 <strong><code>false</code></strong>，如果发生了一个错误则返回一个错误码。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.bzdecompress-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>8.0.0</td>
      <td>
       <code class="parameter">use_less_memory</code> 的类型从 <span class="type">int</span> 变为 <span class="type">bool</span>。
       之前默认值为 <code class="literal">0</code>。
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.bzdecompress-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-705">
    <p><strong>示例 #1 解压一个字符串</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$start_str&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"This&nbsp;is&nbsp;not&nbsp;an&nbsp;honest&nbsp;face?"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$bzstr&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">bzcompress</span><span style="color: #007700">(</span><span style="color: #0000BB">$start_str</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #DD0000">"Compressed&nbsp;String:&nbsp;"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">$bzstr</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #DD0000">"\n&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$str&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">bzdecompress</span><span style="color: #007700">(</span><span style="color: #0000BB">$bzstr</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #DD0000">"Decompressed&nbsp;String:&nbsp;"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">$str</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #DD0000">"\n&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.bzdecompress-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.bzcompress.html" class="function" rel="rdfs-seeAlso">bzcompress()</a> - 把一个字符串压缩成 bzip2 编码数据</span></li>
   </ul>
  </p>
 </div>

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